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A sensitive, rapid, and simple multiresidue method for the simultaneous determination of six postemergence herbicides currently used in rice cultivationmetsulfuron methyl, bensulfuron methyl, pyrazosulfuron ethyl, bentazone, bispyribac sodium, and cyhalofop butylin drinking and paddy-field water is presented. Water samples were extracted with solid-phase extraction cartridges. Final determination was made by LC with diode-array detection. The extraction efficiencies of C18 and HLB cartridges were compared. The average recovery obtained for these compounds for the lowest spiked level (0.1 g/L) varied from 70 to 122 for C18 and 75119 for HLB, with RSDs of 11 and 8.3, respectively. The method had good linearity, and the lower detection limit for the pesticides studied varied from 0.03 to 0.04 g/L. The proposed method was also tested in paddy-field water, with recovery studies giving good results with low RSDs at 1.0 g/L.

Liquid ChromatographicDiode-Array Detection Multiresidue Determination of Rice Herbicides in Drinking and Paddy-Field Water